Sources of Light MCQ - Electrician (Set-1) with Answers

Sources of Light MCQ - Electrician (Set-1) with Answers

41) Upon which one of the following, the current flow through the Neon-sign tubes depends ?

Answer is:

The diameter of the tube

42) Colour of the light from the Neon-sign lamp depends on which one of the following

Answer is:

Gases in the tube

43) Which one of the basic fluorescent powder is used in neon sign lamp to get blue colour ?

Answer is:

Calcium tungstate

44) The average life of sodium vapour lamp is about

Answer is:

6000 hours

45) Light used in the front yard of the house should not attract insects in view of safety. Which type of lamp you will avoid ?

Answer is:

Mercury vapour lamp